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The aim of the study was to find out whether carriers of new genetic defect Cholesterol Deficiency (CD) occur in the population of Polish Holstein-Friesian bulls. Twenty seven bulls were included in the analysis. Bulls were selected as having in the pedigree known carrier of CD (Maughlin Storm CANM000005457798). All bulls were diagnosed by the test described by Menzi et al. (2016) by using allele-specific PCR. Among 27 bulls, 9 new CD carriers were found. Our results show that causal mutation for CD is already transmitted to Polish Holstein-Friesian cattle. The results are sufficient ground to take practical action in order to avoid further spreading of mutation causing CD.
An increasing number of Holstein calf births exhibiting vertebral deformations has been detected in Denmark since 1999 by a program monitoring the incidence of genetic diseases. Pedigree analysis demonstrated that the affected calves originated from a family afflicted by an autosomally recessively inherited complex vertebral malformation (CVM) syndrome. To determine the actual carrier frequency of the CVM-determining mutation in a population of Polish Holstein-Friesian (=Polish Black-and-White) cattle, we examined 202 proven bulls (active in 2001-2005) used by 4 domestic artificial insemination companies and 403 unproven bulls (under evaluation for breeding value). Out of the 605 bulls examined, 150 T/G heterozygotes were diagnosed, including 118 that were sons of known CVM carriers. Identification of a gene polymorphism in a bovine solute carrier family 35 member 3, termed SLC35A3, was conducted with the use of a new PCR-SSCP method (polymerase chain reaction - single stranded conformation polymorphism), which - due to its ease of use and high reliability - can be applied in widespread screening programs aimed at reducing the incidence of the CVM defect.
The aim of this paper was to verify the hypothesis whether carriers of genetic defect Brachyspina occur in the Polish Holstein-Friesian Cattle. PCR method was used to screen 78 Polish Hol-stein-Friesian bulls. Eight bulls were identified as heterozygotes for 3,3 kb deletion in the FANCI gene - the mutation causing Brachyspina defect. All carriers were sons of 3 sires: Cleitus Jabot, Sandy-Valley Bolton ET and Coyne-Farms Dorcy ET which were descendants of the US sire Sweet Haven Tradition (HOUSAM 1682485). Systematic screening of young bulls having in the pedigree Barchyspina carrier is necessary to prevent spreading of the recessive mutation in the dairy cattle population in Poland.
DUMPS (Deficiency of Uridine Monophosphate Synthase) is a hereditary recessive disorder in Holstein cattle causing early embryo mortality during its implantation in the uterus. The only way to avoid the economic losses is early detection of DUMPS carriers. Because American Holstein semen has been intensively imported to Poland since 1970, there was a risk that DUMPS could have spread in Polish dairy cattle. In our study, 2209 dairy cattle of the Polish Holstein breed have been screened by the DNA test. The dominant group was young bulls entering the testing program (1171) and proven bulls (781). They represented all sires entering Polish breeding programs between 1999 and 2003. Also, 257 sire dams were included in the screening program. No DUMPS carrier has been found. Our results then indicate that the population of dairy cattle reared in Poland is free from DUMPS. Because of the economical significance of the DUMPS mutation and its recessive mode of inheritance, attention has to be paid to any case of a bull having in his origin any known DUMPS carrier. Such a bull should be tested and if positive eliminated from the active population. Also, young bulls (testing bulls) should be screened for DUMPS if in their progeny a high incidence of embryo mortality is observed and their genealogy cannot exclude their relatedness to any DUMPS carriers.
Besides its nutritional value, bovine beta-casein is a source of bioactive peptides called betacasomorphins produced during digestion of raw or processed milk. It was shown that the betacasomorphin 7 originates only from beta-casein variants A1 or B and may be a significant risk factor in human ischemic heart disease, arteriosclerosis, type I diabetes and sudden infant death syndrome. In this study, the frequency of the A1 allele in a sample of Polish Holstein bulls commonly used in artificial insemination (A. I. bulls) was analysed and the potential for production of milk capable of releasing undesirable beta-casomorphin 7 is discussed. Among 143 A. I. bulls, three genotypes were identified (A1/A1, A2/A2, A1/A2) resulting in frequencies of 0.402 and 0.598, for A1 and A2, respectively. Although, the clinical implications of A1 milk on human health is still under discussion it may be necessary to monitor reproductive bulls and decrease the frequency of allele A1.
The aim of the present study was to verify the hypothesis that α-lactalbumin (LALBA) gene polymorphism may be a factor differentiating defence mechanisms in cattle. The association between LALBA polymorphism and the levels of blood indices characterising defence functions were examined in a group of 129 female calves and young heifers, produced by random mating of parental couples. The levels of blood diagnostic indices were determined four times: at 15 to 30 d, 3 months, 6 months, and 12 months of age. The genotypes distribution within the progeny was uneven (LALBA AA - 59.7%, LALBA AB - 35.7%, LALBA BB - 4.6%). At all times of the analysing, statistically significant differences between LALBA genotype groups were observed in the number of leukocytes (LALBA AA>LALBA BB), and the percentage of eosinophils (LALBA BB> LALBA AA). LALBA polymorphism also differentiated the percentages of lymphocytes (15 to 30 d, 3 months), neutrophils (15 to 30 d, 3 months, 12 months), basophils (6 and 12 months), and monocytes (6 months). Differences in the levels of total protein and γ-globulin were relatively low in animals aged 15 to 30 d, 3 months, and 6 months, but high in those aged 12 months (LALBA AB>LALBA AA>LALBA BB). There was a correlation between LALBA polymorphism and lysozyme activity (LALBA AA>LALBA AB> LALBA BB). Higher values of the NBT reduction tests were recorded in calves aged 15 to 30 d, as compared with older ones.
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